OK next question: Tugging on ham. rail chek lost motion

[David Nereson]

You're not really checking lost motion, but, as you said in your first post, the lack thereof.  You can depress the damper pedal (so the returning wippens don't have any assist from damper lever springs), then depress ten keys at a time and let them up very slowly, looking to see if any jacks don't snap all the way under their hammer butts.  If they don't, turn the capstan down by quarter turns until the jack returns all the way when the key is let up slowly.  Otherwise, the visual "backcheck wink" method is as good as any -- very lightly tap on the keys and see if the backcheck just "winks" before the butt moves (watch the catcher).  Or, as someone else suggested, press on the tail end of the keys, mashing them into the back rail felt a little, and see if any hammers wink backwards.  If so, the jacks are holding them up off the rail a little.  
    --David Nereson, RPT
  ----- Original Message ----- 
  From: KeyKat88 at aol.com 
  To: pianotech at ptg.org 
  Sent: Friday, February 08, 2008 10:13 PM
  Subject: OK next question: Tugging on ham. rail chek lost motion


  Greetings,

        Thank you for answers validating my method of checking lost motion. 
  NEXT question....Then how can I check lost motion when this one piano a customer has, has a brace which will not allow the rail to move with a backwards tug and I cant check the lost motion, Is there another way of checking it? I am guessing I have to go key to key and check it.

  THank you
  Julia
  Reading, PA 





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